the end off of the supplied mounting bar.
Mounting bar stub in place atop scale.
the mill frame is tapered, in order to get the scale truly
perpendicular to the knee, I had to resort to some creative
hacksawing*. The scales each came with a mounting bar that
allowed the scales to be adjusted but, since the taper of the mill
frame was too much for the stock bar and there being a lack of
clearance when the bar was used, I simply cut one end off of the bar.
It was bolted to the top of the scale and, using a spacer and
some longer bolts, allowed for the scale to be offset enough to get the
scale to within 0.005" of true throughout the full range of Z motion.
I would have used my bandsaw but, yesterday the gearbox finally gave-up
the ghost. I think the worm gear has worn out but I won't know
until I get it apart. If the gear's shot, I'll have to get a new
bandsaw. That one was given to me a few years ago because the
owner couldn't get it to cut straight. Some creative filing,
hammering and cursing got it to cut reasonably well but it was
semi-junk then and is total junk now (if the gear's worn out).
For what it cost me, it's given very good service.
Cutting unwanted part off of supplied bracket.
Bracket in place at
lower end of scale.
bottom mounting of the scale consisted of simply bolting it to the mill
frame and shimming it to be parallel to the plane of the knee.
sensor was mounted using one of the supplied brackets, modified to fit.
It was cut as shown and two oversize mounting holes were drilled
(arrows) to accomodate final adjustment. The sensor also had to
be shimmed to run true along the length of the scale.
Z scale and sensor in place.
you can see, the scale is right in the path of chips and crud, so it's
going to be necessary to work out some kind of shielding for it.
All three axes working!